That little failed post-fight drug test by Nick Diaz, the one that showed marijuana metabolites in his system, that is turning out to be one hefty mistake.

MMAjunkie.com recently confirmed with Nevada Athletic Commission Executive Director Keith Kizer that Diaz was fined $79,500 of his $200,000 purse.

It had been previously reported that Diaz would be fined 30 percent and suspended for one-year. He tried to fight the suspension, but was unsuccessful.

While Diaz announced his retirement after the loss to Carlos Condit at UFC 143, most believe the Stockton bad boy will be back in action next year when his suspension is over.

Photo credit: CombatLifestyle.com